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Titolo:
Speed tuning of motion segmentation and discrimination
Autore:
Masson, GS; Mestre, DR; Stone, LS;
Indirizzi:
CNRS, Ctr Rech Neurosci Cognit, F-13402 Marseille, France CNRS MarseilleFrance F-13402 Neurosci Cognit, F-13402 Marseille, France NASA, Human Informat Proc Res Branch, Human Factors Res & Technol Div, Ames Res Ctr, Moffett Field, CA 94035 USA NASA Moffett Field CA USA 94035 Ames Res Ctr, Moffett Field, CA 94035 USA
Titolo Testata:
VISION RESEARCH
fascicolo: 26, volume: 39, anno: 1999,
pagine: 4297 - 4308
SICI:
0042-6989(1999)39:26<4297:STOMSA>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEMPORAL VISUAL AREA; RANDOM-DOT PATTERNS; TRANSPARENT MOTION; MACAQUE MONKEY; DIRECTION SELECTIVITY; FUNCTIONAL-PROPERTIES; MOVING PATTERNS; VELOCITY; PERCEPTION; MT;
Keywords:
motion perception; speed segmentation; speed discrimination; transparency; structure-from-motion;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
61
Recensione:
Indirizzi per estratti:
Indirizzo: Masson, GS CNRS, Ctr Rech Neurosci Cognit, F-13402 Marseille, France CNRSMarseille France F-13402 gnit, F-13402 Marseille, France
Citazione:
G.S. Masson et al., "Speed tuning of motion segmentation and discrimination", VISION RES, 39(26), 1999, pp. 4297-4308

Abstract

Motion transparency requires that the visual system distinguish different motion Vectors and selectively integrate similar motion vectors over space into the perception of multiple surfaces moving through or over each other. Using large-field (7 degrees x 7 degrees) displays containing two populations of random-dots moving in the same (horizontal) direction but at different speeds, we examined speed-based segmentation by measuring the speed difference above which observers can perceive two moving surfaces. We systematically investigated this 'speed-segmentation' threshold as a function of speed and stimulus duration, and found that it increases sharply for speeds above approximate to 8 degrees/s. In addition, speed-segmentation thresholds decrease with stimulus duration out to approximate to 200 ms. In contrast, under matched conditions, speed-discrimination thresholds stay low at leastout to 16 degrees/s and decrease with increasing stimulus duration at a faster rate than for speed segmentation. Thus, motion segmentation and motiondiscrimination exhibit different speed selectivity and different temporal integration characteristics. Results are discussed in terms of the speed preferences of different neuronal populations within the primate visual cortex. (C) 1999 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 19:18:46